Question about 1989 Jaguar XJS 4.0
How to replace the fuel pressure regulator on a 1990 jaguar xjs
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Posted on Jan 02, 2017
What you need to do is remove the 2 screws on the top bezel from inside the engine bay, then underneath the outer corner of the plastic headlamp surround there is a philips screw, (put your head under neath car near from wheel) loosen the screw, do not remove it, now the headlamp plastic bezel/surround will come free enough so you can get a philips screwdriver in through the middle of the headlamp surround, there is a chrome retaining ring holding the headlamp in place, loosen the 3 philips screws (do not remove) The retaining ring will rotate and you can slide the ring out from the outer edge of the headlamp surround. The headlamp will then come out throught the middle of the surround, disconnect the 3 pin multiplug and reverse process for install.
Posted on Sep 19, 2008
SOURCE: 1989 jaguar xjs v12 fuel mixture
Chances are the coolant temperature sensor or its wiring have failed, or the vacuum line to the MAP sensor is leaky or broken (I believe the V12 in '89 guise uses MAP sensors). The MAP sensor measures Manifold Absolute Pressure. Along with this pressure the ECU looks at engine RPM. It also measures air temperature. Knowing pressure and temperature we know density, and knowing engine speed tells us how much volume of air is going through the engine. All of this together is computed into air mass and is used to calculate how much fuel mass should be admitted. If the vacuum line is broken, the ECU reads less vacuum and produces rich mixture thinking that the engine is under high load.
Posted on Dec 27, 2008
have you tried reversing the pipes and see if that makes any difference other than that there must be a pressure difference between the two pumps try priming the filter with oil before starting.
Posted on Mar 27, 2009
There are two 13mm bolts in the back window under the carpet that have to be removed. Remove the two plastic screws, Remove the carpet and find the two 13mm bolts..
Posted on Jun 25, 2009
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